I’m using a new MacBook Pro with the latest OS. Lightroom is also up to date. Slides count is 60. Orientation of images are landscape and portrait, no music . 1080p

I found that if you edit pictures or slideshow then create the video, it gets stuck. To be successful I reboot the machine, reopen Lightroom and if I create the video straight away it completes in less than 5 minutes.

Tried rebooting, generating 1:1 preview, and few other suggestion found on internet several times, to no help. What worked at the end - exported all images as jpeg's, Re-imported them back and same slideshow worked, likely some random edit did not worked (it still exported pdf or jpg's well).

Shame on Adobe for no QA on software - looks like slideshow module is broken in some way almost in every version for several years already!